vg_platform.h

   1 #ifndef VG_PLATFORM_H
   2 #define VG_PLATFORM_H
   3
   4 #ifdef VG_RELEASE
   5  #define VG_STATIC static
   6 #else
   7  #define VG_STATIC
   8 #endif
   9
  10 //#include "vg.h"
  11 #include "vg_stdint.h"
  12
  13 /* Copyright (C) 2021-2022 Harry Godden (hgn) - All Rights Reserved */
  14
  15 typedef unsigned int uint;
  16
  17 typedef int             v2i[2];
  18 typedef int             v3i[3];
  19 typedef int             v4i[4];
  20 typedef float           v2f[2];
  21 typedef float           v3f[3];
  22 typedef float           v4f[4];
  23 typedef v2f                     m2x2f[2];
  24 typedef v3f                     m3x3f[3];
  25 typedef v3f                     m4x3f[4];
  26 typedef v4f       m4x4f[4];
  27 typedef v3f                     boxf[2];
  28
  29 // Resource types
  30 typedef struct vg_tex2d vg_tex2d;
  31
  32 struct vg_achievement
  33 {
  34         int is_set;
  35         const char *name;
  36 };
  37
  38 #define vg_static_assert _Static_assert
  39 #define vg_list_size( A ) (sizeof(A)/sizeof(A[0]))
  40 #define VG_MUST_USE_RESULT __attribute__((warn_unused_result))
  41
  42 #include <stdio.h>
  43 #include <dirent.h>
  44 #include <string.h>
  45 #include <stdarg.h>
  46 #include <ctype.h>
  47 #include <math.h>
  48 #include <assert.h>
  49
  50 enum strncpy_behaviour{
  51    k_strncpy_always_add_null = 0,
  52    k_strncpy_allow_cutoff = 1,
  53    k_strncpy_overflow_fatal = 2
  54 };
  55
  56 VG_STATIC void vg_fatal_error( const char *fmt, ... );
  57 VG_STATIC u32 vg_strncpy( const char *src, char *dst, u32 len,
  58                           enum strncpy_behaviour behaviour )
  59 {
  60    for( u32 i=0; i<len; i++ ){
  61       dst[i] = src[i];
  62
  63       if( !src[i] ) return i;
  64
  65       if( i == len-1 ){
  66          if( behaviour == k_strncpy_always_add_null ){
  67             dst[i] = '\0';
  68             return i;
  69          }
  70          else if( behaviour == k_strncpy_overflow_fatal ){
  71             vg_fatal_error( "Strncpy dest exceeded buffer length\n" );
  72          }
  73       }
  74    }
  75
  76    return 0;
  77 }
  78
  79 typedef struct vg_str vg_str;
  80 struct vg_str{
  81    char *buffer;
  82    u32 i, len;
  83 };
  84
  85 VG_STATIC void vg_strnull( vg_str *str, char *buffer, u32 len )
  86 {
  87    str->buffer = buffer;
  88    str->buffer[0] = '\0';
  89    str->i = 0;
  90    str->len = len;
  91 }
  92
  93 VG_STATIC void vg_strcat( vg_str *str, const char *append )
  94 {
  95    for( u32 i=0; str->i < str->len; i++, str->i ++ ){
  96       str->buffer[ str->i ] = append[i];
  97
  98       if( append[i] == '\0' ) return;
  99    }
 100 }
 101
 102 VG_STATIC int vg_strgood( vg_str *str )
 103 {
 104    if( str->i == str->len ){
 105       if( str->buffer[str->i -1] == '\0' ) return 1;
 106       else return 0;
 107    }
 108    else return 1;
 109 }
 110
 111 VG_STATIC char *vg_strch( vg_str *str, char c )
 112 {
 113    char *ptr = NULL;
 114    for( u32 i=0; i<str->i; i++ ){
 115       if( str->buffer[i] == c )
 116          ptr = str->buffer+i;
 117    }
 118
 119    return ptr;
 120 }
 121
 122 VG_STATIC u32 vg_strdjb2( const char *str )
 123 {
 124    u32 hash = 5381, c;
 125
 126    while( (c = *str++) )
 127       hash = ((hash << 5) + hash) + c; /* hash * 33 + c */
 128
 129    return hash;
 130 }
 131
 132 VG_STATIC int vg_strdjb2_eq( const char *s1, u32 h1,
 133                              const char *s2, u32 h2 )
 134 {
 135    if( h1 == h2 ){
 136       if(!strcmp(s1, s2)) return 1;
 137       else return 0;
 138    } else return 0;
 139 }
 140
 141 #define VG_STRDJB2_EQ( CS1, S2, H2 ) \
 142    vg_strdjb2_eq( CS1, vg_strdjb2(CS1), S2, H2 )
 143
 144
 145 #define VG_MIN( A, B ) ((A)<(B)?(A):(B))
 146 #define VG_MAX( A, B ) ((A)>(B)?(A):(B))
 147 #endif